Preparation and Properties of Porous α-Al2O3 Based Ceramic Disk Substrates

doi:10.3724/SP.J.1077.2013.12441

Abstract

Abstract: Porous α-Al₂O₃ based ceramics disks were prepared by dry pressure molding method. Influences of sintering temperature and SiO₂ dopant on the structure, morphology and properties were investigated. It was founded that compressive strength and shrinkage ratio of α-Al₂O₃ ceramic disk both increased with increasing sintering temperature. The shrinkage ratio and compressive strength was less than 0.5% and stronger than 80 MPa, respectively, while the optimum sintering temperature was chosen to be 1180℃. The sintering of α-Al₂O₃ ceramic disk would be enhanced by doping SiO₂, which crystallized into cristobalite phase from an amorphous phase during the sintering process. α-Al₂O₃ ceramic disk doped with 12wt% SiO₂ sintered at 1180℃ exhibited a stronger compressive strength (110 MPa) and a shrinkage ratio of 1.2%. The ceramic disk possessed a smaller pore size but a wider pore size distribution than that of the pure α-Al₂O₃ ceramic disk. It was demonstrated that both α-Al₂O₃ and SiO₂ doped α-Al₂O₃ ceramic disk substrates were favorable for the growth of ZSM-5 zeolite membranes. However, these ZSM-5 zeolite membranes showed different morphologies and crystal sizes, due to the difference in physicochemical properties of substrates.

Key words: porous Al₂O₃ ceramics, shrinkage ratio, compressive strength, zeolite membrane

CLC Number:

TQ174

CHEN Sheng-Bo, LIU Xu-Guang, ZHANG Bao-Quan. Preparation and Properties of Porous α-Al₂O₃ Based Ceramic Disk Substrates[J]. Journal of Inorganic Materials, 2013, 28(06): 599-604.

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Preparation and Properties of Porous α-Al₂O₃ Based Ceramic Disk Substrates

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